Make TICL's AndroidChannelPreferences access SharedPreferences via ContextUtils.getApplicationContext()

In order to use InMemorySharedPrefereces in tests.

Bug: 966837, 441859
Change-Id: I33a7b008173432f1acd23b3ad6566761179c095d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628677
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663335}
9 files changed